Merge branch 'master' into pre

service/upgrade.ts

+import Axios from 'axios';
+
+const enum Status {
+    Default,
+    Upgrading
+}
+
+
+export class UpgradeController {
+    public static getUpgradingRange() {
+        return Axios
+            .get<{ code: Status; start: string; end: string }>(
+                `https://serverstatus.qinqinxiaobao.com/v0/servicestatus/apiservice/status/?t=${new Date().valueOf()}`
+            ).then(r => {
+                if (r && r.data && r.data.code === Status.Upgrading) {
+                    return { start: r.data.start, end: r.data.end };
+                }
+                return { start: '', end: '' };
+            });
+    }
+}